A little fuel system help
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Freshman User
Joined: Jan 2014
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A little fuel system help
I’ve got a ‘13 550 that decided to die on me. Last week I had a low fuel pressure warning. Decided it was time to change filters. Before I had a chance to, the little oil can light came on, the truck lost all power, and eventually coughed and died. I put new filters in it and followed the priming procedure. No such luck on a restart. I can hear the frame mounted pump running. But when I crack open the drain on the bottom of the cap, I get nothing dripping out. I’m an idiot and would typically just throw a new pump on and give it a shot. But, between the 500 dollar price tag, and the additional in-tank sending unit, I was hoping to get a little more testing in. Is there any way to test the sending unit and frame mounted pump independently?
Senior User
Joined: Feb 2020
Posts: 396
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From: Fort Mill SC
Lots of threads about crap in the tank, mostly the cap for the def bottle, dropping the tank isn't all that bad, did it myself with half a tank, it was super clean, my issue was a poor connection to the passenger side battery, found this out over a grand into it.
Hotshot
Joined: Oct 2006
Posts: 10,187
Likes: 8,069
From: Texas
Are you familiar with the fuel filters on the 2011-2016 6.7 PSD?
Meaning.......are you SURE the lower (frame mounted) filter housing is screwed ALL THE WAY on to the stop?
If it is not, it will not prime.
Good luck.
Meaning.......are you SURE the lower (frame mounted) filter housing is screwed ALL THE WAY on to the stop?
If it is not, it will not prime.
Good luck.
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Freshman User
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I’ve only recently become familiar with them. But it’s definitely hitting the stop.
I’ve got FORScan on my phone. Do you know if it will monitor pressure? I can’t seem to find it.
I’ve got FORScan on my phone. Do you know if it will monitor pressure? I can’t seem to find it.
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Tuned
Joined: May 2019
Posts: 279
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From: Brookings, SD
The low side fuel pressure PID in Forscan is named FLP, description is Low Side Fuel Pressure.
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Freshman User
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well, I’m definitely not a FORScan expert. But I can’t find the FLP to save my life. Found plenty of other fuel related pids, but not that one specifically (or any others that related to low side fuel pressure).
as it sits, when I’m monitoring all the fuel related pids and the truck is cranking, I get zero movement out of any of the gauges.
actually, now that I’m looking at it, the RPM pid doesn’t move while the truck is cranking. Apparently I need to learn how to use FORScan.
When I pull the yellow plug from the separator, I should be leaking fuel, correct?
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genuine motorcraft filters, dorman cap. All the o rings are in place. Fresh coating of oil on them and tightened until I felt the stop.
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Freshman User
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Didn’t have a motorcraft available and I was hoping to get my dead truck off the side of the road.
let’s say the dorman cap is crap. It’s letting air by. Would that explain the lack of fuel in the cap? Is the dcfm the only thing pulling fuel past that filter?
let’s say the dorman cap is crap. It’s letting air by. Would that explain the lack of fuel in the cap? Is the dcfm the only thing pulling fuel past that filter?
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Joined: Aug 2008
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From: Frederick, MD
yes the DCFM has the pump too. I would suspect that is an issue, but you could pull and try again.
Other thoughts that have been mentioned is a blockage in the pick up from the tank or no fuel at all.
Have you checked for proper installation of the top fuel filter.
Other thoughts that have been mentioned is a blockage in the pick up from the tank or no fuel at all.
Have you checked for proper installation of the top fuel filter.